Add support for time zone offsets to TimeZone #7977

Job	Run time
Build	41m 53s
Spark Aggregate Fuzzer	15m 47s
Spark Fuzzer	15m 51s
Presto Fuzzer	15m 54s
Join Fuzzer	15m 58s
Exchange Fuzzer	16m 25s
Presto Bias Fuzzer	0s
Aggregation Fuzzer with Presto as source of truth	23m 57s
Window Fuzzer with Presto as source of truth	17m 28s
Writer Fuzzer with Presto as source of truth	17m 25s
RowNumber Fuzzer	15m 35s
Spark Bias Fuzzer	0s
Signature Changes	7s
Biased Aggregation Fuzzer with Presto as source of truth	0s
	3h 16m 20s

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